%I #4 Feb 24 2012 12:50:53
%S 1,0,-12,-360,-4592,866880,144205248,10276506240,-1972062209792,
%T -1066588240250880,-219129099375885312,33054966279836497920,
%U 54554661987210721497088,24677742880461438548951040
%N sech(sinh(x)*tan(x))=1-12/4!*x^4-360/6!*x^6-4592/8!*x^8...
%K sign
%O 0,3
%A Patrick Demichel (patrick.demichel(AT)hp.com)